Casing-perforator.



E. B. NOBLE.

CASING PERFORATOR.

APPLICATION HLED mml. 1917.

1 y'', 1 G. Patente' Nov. 20, 1917.

II ST nnfr Fmon EUGENE anonim, or Los ANGnLEs, CALIFORNIA.

oAsING-PERFORATOR.

Application filed February 27,'1917. Serial No. 151,179.

To aZZ whom t may concern:

Be it known that I, EUGENE B. NoBLn, a citizen of the United States, residingat Los Angeles, in the county of Los Angeles, State of California, have invented new and useful .Improvements in Casing-Perforators, of which the following is a specification.

This invention relates to devices for perforating pipes, tubes, casings and the like; more specifically, for perforating well casings; and the invention eomprises the provision of certain simple means whereby a casing may be perforated with the perforations at any suitable or desirable spacing from each other.

In the usual casing perforator heretofore' in common use, a perforating wheel has been provided with a plurality of peripheral perforating teeth. The wheel is mounted 1n a mandrel in such a manner as to be pressed against one side of the casing to press the perforating teeth through the casing wall. As the wheel rotates, the different teeth come into engagement with the casing; and the wheel rolls by virtue of the tractional engagement of the perforating teeth with the casing. In order to keep the wheel rolling, and not allow it to slip on the casing, it is necessary to have the perforating teeth spaced close enough together thatthere will always be at least one tooth in engagement with the casing. The size of such perforating Wheels is limited; and the linear spacing between adjacent perforations is therefore normally limited by the size of the wheel and the peripheral spacing of the teeth on the wheel. For instance, the size of such a wheel may be usually up to six or eight inches in diameter; and 'there usually must be at least six teeth in 'order to give the wheel its proper tractional engagement with the casing. Thus, in a six-inch wheel, the spacing of the perforations is approximately three inches; and in many cases this spacing is too small-there are too many perforations in the casing.

I overcome these difficulties by providing a means for causing the proper tractional engagement of the perforating wheel with the casing without the necessity of depending upon the tractional effect of the perforating teeth.

I explain a preferred form of my invention in the following specification, reference being had to the accompanying drawings in which Figure 1 is a section showing my improved perforato-r; Fig. 2 is an enlarged .side view of my improved perforating wheel; and Fig. 3 is an edge view of the same. i

In the drawings the numeral 10 designates a suitable mandrel which may be of any character, vand adapted at its upper end, as shown at 11, to be attached to a string ofv tools. The perforating wheel 12 is mounted in the mandrel 10, preferably by being mounted on a short shaft 13. The shaft 13 may be mounted in suitable bearings'l slidable in slots 15 in the mandrel; said slots 15 being located diagonally so that, when the wheel is in its upper position, as shown in full lines in the drawings, its periphery is forced out into engagement with the casing; while when the wheel is in its lower position, it is free from engagement with the casing. Vhen the mandrel is moved upwardly, the wheel slides down, so as to allow the mandrel to be withdrawn from the casing3'but when the mandrel is moved downwardly, the wheel may move .up and move into engagement with the casing; and further downward movement of the mandrel will then cause, rotation of the wheel against the casing, causing perforation of the casing.

In my perforating wheel I may provide any suitable number of perforating teeth.

16;. either one or any larger number. The periphery of the perforating wheel, other than at the teeth, is substantially circular and is provided with casing engaging serrations 17 adapted to tractionally engage the casing without being adapted to perforate it or materially cut or abrade it. I have shown the wheel 12 as provided with three teeth. If the wheel is 8" in diameter, then the spacings of the perforations will be approximately l8. I may, however, provide either two teeth or a smgle tooth; providing the remaining portions of the periphery with serrations 17; and then the spacings of the perforations will be twelve or twentyfour inches.

It will be seen that the essential feature of my invention is the provision of means on the substantially circular periphery of the wheel to give tractional engagement with the casing independently of the engagement by the perforating teeth. This provision enables me to space the perforating teeth farther apart than they could heretofore be spaced; because the tractional serrations keep the Wheel revolving and bring the perforating teeth or tooth into proper perforating` engagement With the Casing. Spaoing the holes or perforations farther apart has the effect of obviating the Weakening of the Casing that always takes place When the perforations are Close together (so close together in some Cases that they form almost a continuous slot), and has the effect of not allowing the entry of so much Sand as When there are many closely spaced perforations. i

I have not herein shown any devices for raising the perforating Wheel on the mandrel for the reason. that such device does not enter into my Vinvention; but any suitable device may be used for the purpose, such as the trip Controlled spring usually provided.

Having described a preferred form of my invention, I claim:

1. In a Casing perforator, the combination of a body, and a perforating Wheel movable and revolu'ble therein, said Wheel having a projecting peripheral Casing perforating tooth and an otherwise substantially Circular periphery provided With casing engaging serrations.

2. In a Casing perforator, the Combination of a body, and a perforating` wheel movable and revoluble therein, said Wheel having a plurality of projecting Casing perforatng teeth and having` a periphery between said teeth substantlally circular and provided with Casing engaging serrations.

3. In a Casing perforator, the Combination of a body, and a perforating` wheel movable and revoluble therein, said Wheel having a plurality of projecting peripheral casing perforating teeth and having` a periphery between said teeth substantially Circular and provided with Casing engaging serrations, said Casing' engaging serrations being small and adapted to give the Wheel a tractional engagement With the casinO'.

4. In a device ofthe Character described, a perforating Wheel having a substantially Circular periphery With a Casing 'perforating tooth projecting therefrom, the periphery other than the tooth being provided With t'actional serrations.

5. In a device of the Character described, a perforating wheel having a substantially Circular periphery with a. Ca'sing perforating,` tooth projecting therefrom, the periphery other than the tooth being` provided With relatively small serrations adapted to give tractional engagement with a casing but not to perforate it.

6. In a device of the Character described, a perforating Wheel having a substantially circular periphery with a plurality of spaced Casing perforating Jteeth projecting therefrom, the periphery of the Wheel between the perforating` teeth being provided With relatively small serrations adapted to give tractional engagement With the Casing but not to perforate it.

In Witness that I Claim the foregoing I have hereunto subscribed my name this 16th day of February, 1917.

EUGENE B. NOBLE.

Witnesses JAMEs T. BARKELEW, ELWooD I-I. BARKELEW.

3091168 of this patent may be obtained for five cents each, by adressing the Commissioner of Patents, Washington, ID. QL 

